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Inmates are taking part in brutal Fight Club-style bouts sparked by an epidemic of phones being smuggled into UK prisons .
Footage from jails in the Midlands shows a series of bloody arranged contests between prisoners as others cheer them on.
And the violent craze is being blamed on the number of mobile phones being smuggled into the country's jails.
Figures show at least 15,000 mobiles or SIM cards were confiscated in prisons last year - the equivalent of one for every six inmates.